154b96380SRuslan Bukin /*- 254b96380SRuslan Bukin * SPDX-License-Identifier: BSD-2-Clause 354b96380SRuslan Bukin * 454b96380SRuslan Bukin * Copyright (c) 2022 Ruslan Bukin <br@bsdpad.com> 554b96380SRuslan Bukin * 654b96380SRuslan Bukin * This work was supported by Innovate UK project 105694, "Digital Security 754b96380SRuslan Bukin * by Design (DSbD) Technology Platform Prototype". 854b96380SRuslan Bukin * 954b96380SRuslan Bukin * Redistribution and use in source and binary forms, with or without 1054b96380SRuslan Bukin * modification, are permitted provided that the following conditions 1154b96380SRuslan Bukin * are met: 1254b96380SRuslan Bukin * 1. Redistributions of source code must retain the above copyright 1354b96380SRuslan Bukin * notice, this list of conditions and the following disclaimer. 1454b96380SRuslan Bukin * 2. Redistributions in binary form must reproduce the above copyright 1554b96380SRuslan Bukin * notice, this list of conditions and the following disclaimer in the 1654b96380SRuslan Bukin * documentation and/or other materials provided with the distribution. 1754b96380SRuslan Bukin * 1854b96380SRuslan Bukin * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1954b96380SRuslan Bukin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2054b96380SRuslan Bukin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2154b96380SRuslan Bukin * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2254b96380SRuslan Bukin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2354b96380SRuslan Bukin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2454b96380SRuslan Bukin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2554b96380SRuslan Bukin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2654b96380SRuslan Bukin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2754b96380SRuslan Bukin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2854b96380SRuslan Bukin * SUCH DAMAGE. 2954b96380SRuslan Bukin */ 3054b96380SRuslan Bukin 3154b96380SRuslan Bukin #include <sys/param.h> 3254b96380SRuslan Bukin #include <sys/systm.h> 3354b96380SRuslan Bukin #include <sys/bus.h> 3454b96380SRuslan Bukin #include <sys/rman.h> 3554b96380SRuslan Bukin #include <sys/kernel.h> 3654b96380SRuslan Bukin #include <sys/module.h> 3754b96380SRuslan Bukin 3854b96380SRuslan Bukin #include <machine/bus.h> 3954b96380SRuslan Bukin 4054b96380SRuslan Bukin #include <dev/fdt/simplebus.h> 4154b96380SRuslan Bukin #include <dev/fdt/fdt_common.h> 4254b96380SRuslan Bukin #include <dev/ofw/ofw_bus_subr.h> 4354b96380SRuslan Bukin 4454b96380SRuslan Bukin #include "mmio_sram_if.h" 4554b96380SRuslan Bukin 4654b96380SRuslan Bukin #define dprintf(fmt, ...) 4754b96380SRuslan Bukin 4854b96380SRuslan Bukin static struct resource_spec mmio_sram_spec[] = { 4954b96380SRuslan Bukin { SYS_RES_MEMORY, 0, RF_ACTIVE }, 5054b96380SRuslan Bukin { -1, 0 } 5154b96380SRuslan Bukin }; 5254b96380SRuslan Bukin 5354b96380SRuslan Bukin struct mmio_sram_softc { 5454b96380SRuslan Bukin struct simplebus_softc simplebus_sc; 5554b96380SRuslan Bukin struct resource *res[1]; 5654b96380SRuslan Bukin device_t dev; 5754b96380SRuslan Bukin }; 5854b96380SRuslan Bukin 5954b96380SRuslan Bukin static int 6054b96380SRuslan Bukin mmio_sram_probe(device_t dev) 6154b96380SRuslan Bukin { 6254b96380SRuslan Bukin 6354b96380SRuslan Bukin if (!ofw_bus_is_compatible(dev, "mmio-sram")) 6454b96380SRuslan Bukin return (ENXIO); 6554b96380SRuslan Bukin 6654b96380SRuslan Bukin if (!ofw_bus_status_okay(dev)) 6754b96380SRuslan Bukin return (ENXIO); 6854b96380SRuslan Bukin 6954b96380SRuslan Bukin device_set_desc(dev, "MMIO SRAM"); 7054b96380SRuslan Bukin 7154b96380SRuslan Bukin return (BUS_PROBE_DEFAULT); 7254b96380SRuslan Bukin } 7354b96380SRuslan Bukin 7454b96380SRuslan Bukin static int 7554b96380SRuslan Bukin mmio_sram_attach(device_t dev) 7654b96380SRuslan Bukin { 7754b96380SRuslan Bukin struct mmio_sram_softc *sc; 7854b96380SRuslan Bukin phandle_t node; 7954b96380SRuslan Bukin 8054b96380SRuslan Bukin sc = device_get_softc(dev); 8154b96380SRuslan Bukin sc->dev = dev; 8254b96380SRuslan Bukin 8354b96380SRuslan Bukin if (bus_alloc_resources(dev, mmio_sram_spec, sc->res) != 0) { 8454b96380SRuslan Bukin device_printf(dev, "Can't allocate resources for device.\n"); 8554b96380SRuslan Bukin return (ENXIO); 8654b96380SRuslan Bukin } 8754b96380SRuslan Bukin 8854b96380SRuslan Bukin node = ofw_bus_get_node(dev); 8954b96380SRuslan Bukin if (node == -1) 9054b96380SRuslan Bukin return (ENXIO); 9154b96380SRuslan Bukin 9254b96380SRuslan Bukin simplebus_init(dev, node); 9354b96380SRuslan Bukin 9454b96380SRuslan Bukin /* 9554b96380SRuslan Bukin * Allow devices to identify. 9654b96380SRuslan Bukin */ 97*723da5d9SJohn Baldwin bus_identify_children(dev); 9854b96380SRuslan Bukin 9954b96380SRuslan Bukin /* 10054b96380SRuslan Bukin * Now walk the OFW tree and attach top-level devices. 10154b96380SRuslan Bukin */ 10254b96380SRuslan Bukin for (node = OF_child(node); node > 0; node = OF_peer(node)) 10354b96380SRuslan Bukin simplebus_add_device(dev, node, 0, NULL, -1, NULL); 10454b96380SRuslan Bukin 10554b96380SRuslan Bukin return (bus_generic_attach(dev)); 10654b96380SRuslan Bukin } 10754b96380SRuslan Bukin 10854b96380SRuslan Bukin static int 10954b96380SRuslan Bukin mmio_sram_detach(device_t dev) 11054b96380SRuslan Bukin { 11154b96380SRuslan Bukin struct mmio_sram_softc *sc; 11254b96380SRuslan Bukin 11354b96380SRuslan Bukin sc = device_get_softc(dev); 11454b96380SRuslan Bukin 11554b96380SRuslan Bukin bus_release_resources(dev, mmio_sram_spec, sc->res); 11654b96380SRuslan Bukin 11754b96380SRuslan Bukin return (0); 11854b96380SRuslan Bukin } 11954b96380SRuslan Bukin 12054b96380SRuslan Bukin static uint8_t 12154b96380SRuslan Bukin mmio_sram_read_1(device_t dev, bus_size_t offset) 12254b96380SRuslan Bukin { 12354b96380SRuslan Bukin struct mmio_sram_softc *sc; 12454b96380SRuslan Bukin 12554b96380SRuslan Bukin sc = device_get_softc(dev); 12654b96380SRuslan Bukin 12754b96380SRuslan Bukin dprintf("%s: reading from %lx\n", __func__, offset); 12854b96380SRuslan Bukin 12954b96380SRuslan Bukin return (bus_read_1(sc->res[0], offset)); 13054b96380SRuslan Bukin } 13154b96380SRuslan Bukin 13254b96380SRuslan Bukin static void 13354b96380SRuslan Bukin mmio_sram_write_1(device_t dev, bus_size_t offset, uint8_t val) 13454b96380SRuslan Bukin { 13554b96380SRuslan Bukin struct mmio_sram_softc *sc; 13654b96380SRuslan Bukin 13754b96380SRuslan Bukin sc = device_get_softc(dev); 13854b96380SRuslan Bukin 13954b96380SRuslan Bukin dprintf("%s: writing to %lx val %x\n", __func__, offset, val); 14054b96380SRuslan Bukin 14154b96380SRuslan Bukin bus_write_1(sc->res[0], offset, val); 14254b96380SRuslan Bukin } 14354b96380SRuslan Bukin 14454b96380SRuslan Bukin static device_method_t mmio_sram_methods[] = { 14554b96380SRuslan Bukin /* Device Interface */ 14654b96380SRuslan Bukin DEVMETHOD(device_probe, mmio_sram_probe), 14754b96380SRuslan Bukin DEVMETHOD(device_attach, mmio_sram_attach), 14854b96380SRuslan Bukin DEVMETHOD(device_detach, mmio_sram_detach), 14954b96380SRuslan Bukin 15054b96380SRuslan Bukin /* MMIO interface */ 15154b96380SRuslan Bukin DEVMETHOD(mmio_sram_read_1, mmio_sram_read_1), 15254b96380SRuslan Bukin DEVMETHOD(mmio_sram_write_1, mmio_sram_write_1), 15354b96380SRuslan Bukin DEVMETHOD_END 15454b96380SRuslan Bukin }; 15554b96380SRuslan Bukin 15654b96380SRuslan Bukin DEFINE_CLASS_1(mmio_sram, mmio_sram_driver, mmio_sram_methods, 15754b96380SRuslan Bukin sizeof(struct mmio_sram_softc), simplebus_driver); 15854b96380SRuslan Bukin 15954b96380SRuslan Bukin EARLY_DRIVER_MODULE(mmio_sram, simplebus, mmio_sram_driver, 0, 0, 16054b96380SRuslan Bukin BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE); 16154b96380SRuslan Bukin MODULE_VERSION(mmio_sram, 1); 162